no internet connectivity

Important note: The quotes in this post are translated to English so they will most likely not match exactly what's displayed on an English Android mobile. I have a brand new user with a somewhat unusual mobile (CAT S62 Pro), and when he install my app and try to run it, it instantly crashes...

I have a project with ESP8266 as a Access Point with Wifi connection. It has no internet connectivity. Most mobile phones work good. I have problems with never Sony mobiles (Android 8.1 and 9.0). They connect to the ESP8226, detect there is no internet connectivity and disconnect. I have found...